the concept of this is good, the idea of a personal fan is good but you have to be so careful not to catch it and let it fall off because the mechanism that holds the fan will come apart. if you hook it on your belt - which it is made for - and have it blow right in your shirt, you can't forget it is there or pull on your shirt because it will fall off. a stronger hook mechanism might be the answer. you also have to be careful not to let your shirt cover the bottom of the fan because it will block the air flow so you have to tuck your shirt in the outside hook to keep it from blocking the air. and again, that isn't a very strong hook either so your shirt falls out of it. i used in a commercial kitchen to stay cool. airflow is good when it isn't blocked but if you're moving around too much, the odds of it falling off are very good. so i liked it when it was working but it's kind of high maintenance to protect it.
机制薄弱
钩子薄弱
性能弱
性能较弱